feat: use .ls-lint.yaml file as default configuration file

[ccoVeille]

The .ls-lint.yaml file is now used as the default configuration file
The .ls-lint.yml file is still supported for backward compatibility.

The choice was made to prioritize the .ls-lint.yaml file for its clarity
and alignment with YAML file naming conventions.

Fixes #328

[ccoVeille]

@loeffel-io any hope you would review this PR ?

Thanks

[loeffel-io]

LGTM, i think this will make it into 2.4.0 for sure

Really looking forward to find more time for ls-lint but currently my real job is too time consuming

[loeffel-io]

you can easily remove the comments and consts please and then its good to go

background: the legacy config file will be deprecated and removed anyways in a period of time

[ccoVeille]

@loeffel-io I simplified things

[Copilot]

Pull request overview

This pull request changes the default configuration file from .ls-lint.yml to .ls-lint.yaml while maintaining backward compatibility. The change aligns with YAML file naming conventions that prefer the .yaml extension.

Key Changes:

• Modified config file detection logic to prioritize .ls-lint.yaml over .ls-lint.yml
• Updated documentation to reflect the new default while noting backward compatibility
• Added .ls-lint.yaml configuration file to the repository

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
cmd/ls_lint/main.go	Implements fallback logic to check for .ls-lint.yaml first, then .ls-lint.yml if the former doesn't exist
README.md	Updates documentation to show .ls-lint.yaml as the primary config file format, with .ls-lint.yml noted for backward compatibility; also corrects "unicode" to "Unicode"
.ls-lint.yaml	Adds the new default configuration file to the repository

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